Now a days, Coupon Management Sites are very popular and also a good way to customer increasing technique for an e-commerce site. So, I tried to come with a bunch of well known , best , coupon management plugins for wordpress:
This plugin is used to manage coupons which will work nicely with posts and pages. It will work evenly with on sidebar as widget .
I prefer this coupon plugin as it has expiry , when the expiry date is over it will not shown in site. Also easily customizable design facility makes this plugin more effective for the developers.
Coupon Creator another solution of Coupon plugin of wordpress. It supports shortcode , customizable design , very easy color customization with expiry date .
This is another good wordpress coupon plugin , it has the facility to add discount along with others coupon facility .
This is most wonderful plugin for wordpress coupon store , its has the facility to print coupons, and copy to clipboard facility . Also supports shortcodes to display with customizable design facility.